Thriller films originated in the 1920s with Alfred Hitchcock's films based on crime stories. Over time, thrillers developed narratives involving crime, violence, and action. Now thrillers are one of the most established film genres, with different types including psychological thrillers, conspiracy thrillers, and crime thrillers. Typical characters in thrillers include killers, victims, police, and crime solvers who help build audience anticipation. Iconography like weapons, lighting, locations, and silhouettes are used to create suspense and tension. Popular thrillers often spawn sequels and series due to audience reception.